linux-kernel - Re: [PATCH v4 11/13] clk: tegra: Add EMC clock driver

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Message-ID: <20141112161809.GA17305@ulmo>
Date:	Wed, 12 Nov 2014 17:18:11 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-tegra@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	mikko.perttunen@...si.fi, acourbot@...dia.com,
	Mikko Perttunen <mperttunen@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/13] clk: tegra: Add EMC clock driver

On Wed, Nov 12, 2014 at 08:56:34AM +0100, Tomeu Vizoso wrote:
[...]
> diff --git a/drivers/clk/tegra/clk-emc.c b/drivers/clk/tegra/clk-emc.c
[...]
> +#include <linux/clk-provider.h>
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/sort.h>
> +#include <linux/string.h>
> +
> +#include <soc/tegra/fuse.h>
> +#include <soc/tegra/memory.h>

You should include "clk.h" here to avoid a sparse warning.

> +
> +#define CLK_SOURCE_EMC 0x19c
> +
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_SHIFT 0
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_MASK 0xff
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR(x) (((x) & CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_MASK) << \
> +					      CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_SHIFT)
> +
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_SRC_SHIFT 29
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_SRC_MASK 0x7
> +#define CLK_SOURCE_EMC_EMC_2X_CLK_SRC(x) (((x) & CLK_SOURCE_EMC_EMC_2X_CLK_SRC_MASK) << \
> +					  CLK_SOURCE_EMC_EMC_2X_CLK_SRC_SHIFT)
> +
> +const char *emc_parent_clk_names[] = {

This can be static.

> +	"pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud",
> +	"pll_c2", "pll_c3", "pll_c_ud"
> +};
> +
> +/*
> + * List of clock sources for various parents the EMC clock can have.
> + * When we change the timing to a timing with a parent that has the same
> + * clock source as the current parent, we must first change to a backup
> + * timing that has a different clock source.
> + */
> +
> +#define EMC_SRC_PLL_M 0
> +#define EMC_SRC_PLL_C 1
> +#define EMC_SRC_PLL_P 2
> +#define EMC_SRC_CLK_M 3
> +#define EMC_SRC_PLL_C2 4
> +#define EMC_SRC_PLL_C3 5
> +const char emc_parent_clk_sources[] = {

This can be static. And a blank line between the above two would be good
aswell.

> +const struct clk_ops tegra_clk_emc_ops = {

This can be static.

Thierry

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